Faster GTX 680
The new GeForce GTX 770 is based on the GeForce GTX 680. It has the exact same GK104 GPU, with the same number of shader units enable: 1,536. The GTX 770 is faster, however. The GTX 680 has a standard clock speed of 1006 MHz with a 1058 MHz Boost clock, and for the GTX 770 it's been increased to 1046 MHz and 1085 MHz Boost. It's not a world of difference, but still. The video memory has been sped up more, however. Nvidia used the latest generation GDDR5 chips for the GTX 770, and they run at 1753 MHz,which is 250 MHz more than the GDDR5 memory on the GeForce GTX 680. The amount is the same at 2 GB, but manufacturers have the option to increase this to 4 GB.
Long story short, the GeForce GTX 770 has better performance than the GeForce GTX 680 but is priced roughly on the level of the GTX 670. (With the sidenote that since the GTX 670 has been out for some time you can find good deals for it). The GeForce GTX 670 is positioned against the AMD Radeon HD 7970 GHz Edition in terms of pricing.
Nvidia's GeForce GTX 770 reference card has the same cooler as the GTX Titan and the GTX 780. It has a TDP of 230 Watts. The card has two Dual-link DVI ports, one HDMI and one DisplayPort. There are two SLI connectors, but the software currently limits it to triple-SLI.
Since the GPU is identical to that one of the GeForce GTX 680, the features and performance are also the same. Please have a look at our GTX 680 review for the ins and outs of the GK104 GPU.
Since the GTX 770 uses an existing chip, it's relatively easy for Nvidia's partners to make their own version with custom cooler, based on their GTX 680 designs. We received GTX 770 cards from ASUS, MSI and Zotac.